Abstract
We study the effects of an arbitrary external perturbation in the statistical properties of the S matrix of quantum chaotic scattering systems in the limit of isolated resonances. We derive, using supersymmetry, an exact nonperturbative expression for the parameter dependent autocorrelator of two S-matrix elements. Universality is obtained by appropriate rescaling of the physical parameters. We propose this universal function as a signature of quantum chaos in open systems.
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